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ARM: DMA-Mapping: print warning when atomic coherent allocation fails

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Print a loud warning when system runs out of memory from atomic DMA
coherent pool to let users notice the potential problem.

Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Marek Szyprowski 2012-08-22 14:50:42 +02:00
parent 6e5267aa54
commit fb71285f0c
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mm/dma-mapping.c
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@ -461,6 +461,10 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page)
bitmap_set(pool->bitmap, pageno, count);
ptr = pool->vaddr + PAGE_SIZE * pageno;
*ret_page = pool->page + pageno;
} else {
pr_err_once("ERROR: %u KiB atomic DMA coherent pool is too small!\n"
"Please increase it with coherent_pool= kernel parameter!\n",
(unsigned)pool->size / 1024);
}
spin_unlock_irqrestore(&pool->lock, flags);